Structure and Properties of Peptides
The peptide bond in proteins is

is planar because of steric hinderance
only found between proline residues
usually trans unless proline is the next amino acid
usually cis unless proline is the next amino acid

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Structure and Properties of Peptides
In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

four nitrogens of heme and to a water molecule
two nitrogens of heme and to three water molecules
four nitrogens of heme, the proximal His, and a water molecule
two nitrogens of heme and to three His residues in Hb

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